Carassius praecipuus is a species of cyprinid found in the Nam Chat river in Xiangkhouang province in Laos.

It has a compressed, moderately elongate body with a brownish-yellow coloration.

'uncommon') alludes to the unexpected presence of Carassius genus in the Mekong drainage.

It can be distinguished from other species of Carassius by its low count of dorsal fin rays (9-11+1⁄2), lateral line scales (25-27), and gill rakers (20-21).

Carassius auratus consumes invertebrates and plant matter in the wild.